CN103890638A - Distortion compensation for image projection - Google Patents

Distortion compensation for image projection Download PDF

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Publication number
CN103890638A
CN103890638A CN201280051370.7A CN201280051370A CN103890638A CN 103890638 A CN103890638 A CN 103890638A CN 201280051370 A CN201280051370 A CN 201280051370A CN 103890638 A CN103890638 A CN 103890638A
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light
imaging
light source
color
color channel
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CN103890638B (en
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S·S·艾弗森
J·W·鲍伦
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Imax Corp
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Imax Corp
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/147—Optical correction of image distortions, e.g. keystone
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/567—Projection screens for colour projection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/324—Colour aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/334—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using spectral multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/363—Image reproducers using image projection screens
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/3147—Multi-projection systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3158—Modulator illumination systems for controlling the spectrum
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/317—Convergence or focusing systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3185—Geometric adjustment, e.g. keystone or convergence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3191—Testing thereof
    • H04N9/3194—Testing thereof including sensor feedback
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B37/00—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe
    • G03B37/06—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe involving anamorphosis
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Projection Apparatus (AREA)
  • Lenses (AREA)

Abstract

Chromatic aberration can be reduced and extreme projection angles can be allowed in a projection system by modifying one color channel of light having a wavelength bandwidth with image data to produce imaged light, causing the imaged light to spread angularly when displaying the imaged light through an optical distorting element onto a screen, and reducing angular spread of the imaged light exiting the optical distorting element by adjusting the wavelength bandwidth.

Description

For the distortion compensation of image projection
the cross reference of related application
The application requires the right of priority of the U.S. Provisional Application sequence number 61/549,601 of " the Stereoscopic Planetarium Projection " by name that submit on October 20th, 2011.Be incorporated herein by reference in its entirety.
Technical field
Relate generally to of the present invention image projection system, and more specifically (but and not exclusively), relate to the optical projection system for compensating images distortion.
Background technology
In three-dimensional astronomical phenomena (planetarium) projection, two kinds of methods are carried out: (1) is with single projector or be positioned at after spectators, (inset) image and (2) are positioned near multiple projector projecting edge vision-mix dome edge in the projection rectangle " illustration " above of dome near a pair of left-eye/right-eye fluoroscopy images projector dome edge, it covers whole or most of dome, usually in the center of interest region in projected image, has mixed zone.
Illustration image may not utilize the character on the spot in person of projection dome fully.On the other hand, it may be complicated that the edge commingled system that has multiple projector in multiple positions will install and keep to aim at well.
Therefore, expect to have a kind of single projector system or two left-eye/right-eye perspective projection instrument system, wherein, projector is located at after the spectators in dome rear portion, and the enough large parts that illuminate dome are to produce " without frame " sensation on the spot in person.
In addition, expectation is that use standard film parts are so that reduction running cost comprises standard film three-dimensional (3D) glasses and 3D glasses haulage equipment.
Summary of the invention
Some aspect and feature relate to and reduce chromatic aberation and allow the extreme projection angle in optical projection system.
On the one hand, a kind of digital projection method comprises: utilize view data to revise to have the Color Channel of light of wavelength bandwidth to produce the light through imaging.When by optical distortion element by the time that the light of imaging is shown on screen, make to launch angularly through the light of imaging.Reduce the angular spread (angular spread) of the light through imaging that leaves optical distortion element by adjusting wavelength bandwidth.
At least one feature comprises the optical distortion element as single prism distortion adapter.
At least one feature comprises the magnification of revising the light through imaging in vertical dimensions with single prism distortion adapter.
At least one feature comprises the magnification of revising the light through imaging in horizontal dimensions with single prism distortion adapter.
At least one feature comprises the second Color Channel of revising light by view data.View data is focused on screen with the light through imaging from the second Color Channel that leaves optical distortion element with the light through imaging that makes at least one Color Channel that leaves optical distortion element by color curling (warping) processor.
At least one feature comprises to the required wavelength bandwidth that designs the light of at least one Color Channel in light source transmitting.
On the other hand, a kind of system for digital projection comprises spatial light modulator, projecting lens and single prism distortion adapter.Spatial light modulator can with view data revise there is wavelength bandwidth and from the light of at least one Color Channel to produce the light through imaging.Projecting lens can projection through the light of imaging.Single prism distortion adapter is in the output of projecting lens.Can by single prism distortion adapter on screen projection through the light of imaging for showing.Single prism distortion adapter can make to launch angularly from the light of described at least one Color Channel.
At least one feature comprises can be designed to include the light source that comprises required wavelength bandwidth to the transmitting of light source.
At least one feature comprises the LASER Light Source as light source.
At least one feature comprises the laser diode light source as LASER Light Source.
At least one feature comprises the curling processor of color, and it can make to leave the light through imaging of single prism distortion and leave being focused on screen through the light of imaging from second of the second Color Channel of single prism distortion adapter by revising view data.
At least one feature comprises the screen as dome screen.
At least one feature comprises the system being arranged in dual-projection instrument system.
At least one feature comprises the spatial light modulator as 4K spatial light modulator.The wavelength bandwidth of the light source for a color can be decreased to and be less than 10 nanometers.
At least one feature comprises and the wavelength bandwidth of light source can be decreased to and be less than 20 nanometers.
Mentioning these illustrative aspects and feature is not in order to limit or define the present invention, but in order to provide example to help to understand invention disclosed concept in the disclosure.After checking whole disclosing, other aspects of the present invention, advantage and feature will become apparent.
Accompanying drawing explanation
Figure 1A shows the side view of optical projection system environment according to an aspect of the present invention.
Figure 1B shows the top view of the optical projection system in Figure 1A according to an aspect of the present invention.
Fig. 2 shows the side view of a part for the optical projection system environment that comprises the right Figure 1A of anamorphic prism according to an aspect of the present invention.
Fig. 3 shows the side view of a part for the optical projection system environment of Figure 1A that has wherein eliminated the second prism according to an aspect of the present invention.
Fig. 4 shows the example of chromatic aberation according to an aspect of the present invention.
The chromatic aberation in the situation of narrowband light filter that Fig. 5 has shown insertion according to an aspect of the present invention.
Fig. 6 shows the chromatic aberation that filtering and convergence compensate of passing through according to an aspect of the present invention.
Fig. 7 shows according to the example of the utilization factor in the region of the image formation component of some aspect of the present invention.
Fig. 8 show according to an aspect of the present invention for revise light for show method.
Embodiment
Figure 1A and Figure 1B show respectively side view and the top view of a first aspect of the present invention.Show and comprise near be positioned at the edge of dome-shaped projection surface 2 digital projector 1 and the optical projection system of pictcure generator 3.Projector 1 can be to projected image in dome-shaped projection surface 2.Projector 1 can comprise having aspect ratio R(it is about 16:1 or about 17:1) at least one image formation component and there are the horizontal emission angle of approximately 110 degree and the projection objective at the Vertical Launch angle of at least 45 degree (for example 50 degree or 60 degree).Projection objective can comprise tight shot 4, and it can be wide-angle or fish-eye lens.Object lens can be designed with mechanical aperture, and it is small enough to guarantee that neither one image pruned the edge at lens element, and some light of image border drops on one or more lens elements side.In some configuration, wide-angle or fish-eye lens can have the one or more mechanical aperture being greater than in lens element, it prunes some ray, but allow the center of more rays pass through lens, the uneven brightness that causes light level to decline towards image border, also referred to as " vignetting " effect (vignetting).In this projection on the smooth projection screen of film and so on, may not be what expect, but in dome projection, it can make to realize better light utilization efficiency at the center of interest place of projected image, and reduce the light level of the dome edge in observer's eyesight marginal portion simultaneously, thereby reduce the crossed reflex in dome, this crossed reflex again can reduce the effective contrast on the center of interest of projected image, and itself otherwise can cause color wherein to seem the soft image beastly of unsaturated or " smooth "
Also can comprise the curling system 5 of electronic image according to the configuration of an aspect, it can carry out the Geometric corrections that are being input to the image in projector 1, the best that makes technician to calibrate to obtain for being positioned at the observer on different seats to projected image may be experienced compromise, comprises for beholder as much as possible and keeps straight in essence horizontal line.This process can compensate distortion in projection objective and due to the distortion that departs from axis of projection and watch projected image to cause.
Fig. 2 shows the configuration according to first aspect, is positioned at before tight shot 4 comprising the distortion adapter of the first prism 6 and the second prism 7.In other respects, replace the first prism 6 and the second prism 7 with cylindrical lens.Tight shot 4 can have substantially equal magnification in the horizontal and vertical directions, and can make to be out of shape adapter orientation, therefore it stretches image in vertical direction, causes in vertical direction than the amplification factor of larger in the horizontal direction projection objective.This can make first aspect can have to the larger view field on dome, and needn't also increase the magnification in horizontal direction, thereby and there is the pixel that is not projected on screen (for example masked or project to simply on the dark space of projection dome outside).Avoid the more good utilisation that projected pixel can not cause pixel, therefore utilize better available projections illumination and resolution.
Projector 1 can comprise spectral separation stero, and it can make to have discrete and narrow in essence redness, green and blue wavelength band from the radiative spectrum of projector 1, and spectators can wear the 3D glasses with spectral separation light filter.Spectral separation system can comprise rotating filtering wheel, and it alternately carries out filtering to transmitted light between two spectrum, i.e. static light filter, solid-state alternately light filter or have static state or the laser illumination system of spectrum alternately.
Image volume bowed pastern system 5 can be carried out independently Geometric corrections for each primary colors, thereby the color that allows technician to adjust redness, green and blue image plane is assembled calibration, for example, by using white calibration grid, reduce thus the dimness of vision being caused by the chromatic aberation in tight shot 4 and in distortion adapter.In the time using spectral separation stero and emission spectrum therefore to be formed by narrow redness, green and blue wavelength band, calibrate by convergence can effectively reduce to be caused by chromatic aberation fuzzy.This can reduce again to come with the optical devices in tight shot 4 and distortion adapter the needs of complementary color aberration.
In the configuration of first aspect, spectral separation stero can make the spectrum of transmitting replace between the first spectrum and the second spectrum.Pictcure generator 3 can alternately be exported left eye and right eye fluoroscopy images, and image volume bowed pastern system 5 can be side by side assembled calibration and the second color in the first color and assembled between calibration alternately.Can adjust two independent colors by technician and assemble calibration.This can for example complete as follows: 1) white grid is projected as to left-eye image, black image is projected as to eye image, and calibration is red and green geometry, until best possible color is assembled, 2) green grid is projected as to left eye and right eye fluoroscopy images, and calibrate second color assemble green geometry, until the best between two green spectrum may be assembled, 3) red grid is projected as to left eye and right eye fluoroscopy images, and calibrate till red geometry to the best between two red spectrum that the second color assembles may assemble, 4) blue grid is projected as to left eye and right eye fluoroscopy images, and calibrate till blue geometry to the best between two blue spectrum that the second color assembles may assemble.Like this, can make six whole wavelength bands (redness, green and the blueness of the first spectrum and the second spectrum) assemble, if make to be fed to identical image as left eye projection and right eye fluoroscopy images, can in the situation that there is no glasses, observe the single view image that wherein aberration reduces.Color can be assembled to calibration and be stored as independent Geometric corrections, it can carry out after carrying out by the general Geometric corrections of calibrating for optimum experience compromise (that is, straight horizontal line, etc.).Can carry out the execution of those two continuous geometry corrections, make first to calculate the Geometric corrections that obtain for each result of six wavelength bands, then planes of color be carried out to resampling to avoid resampling and associated quality loss continuously.
In alternative configurations, increase the second projector, the second pictcure generator and the second image volume bowed pastern system with the second tight shot and the second distortion adapter.Projector 1 can be launched the light of the first spectrum, and the second projector can be launched the light of the second spectrum.In this configuration, can in each image volume bowed pastern system, individually color be assembled and be calibrated for each projector.
In Fig. 2, distortion adapter can be the right conventional arrangement of prism.An object of the larger prism in this quasi-tradition distortion adapter is to offset the chromatic aberation producing in less prism.For the horizontal projection angle of 110 degree, it is very large and heavy that the second prism may become, and can cause complexity and expensive practicable realization.
Fig. 3 shows the configuration of spectral separation stero.Image volume bowed pastern system 5 can be carried out independently Geometric corrections for each primary colors.Can eliminate the second prism 7 using in Fig. 2.Can be by color being assembled to the visual effect of calibrating to eliminate chromatic aberation.Prism can be arranged in base, and vertical angle can be adjusted.In addition, base structure can be become make to change prism.Also can for example change defocusing between prism of different angles.By selecting between the prism of different angles and/or by adjusting the vertical angle of prism, can realizing different vertical amplifications.Can also select along the degree of the non-linear amplification of vertical axis, it is greater than normally strong in distortion adapter, but may expect in this configuration of dome projection.For example, may expect in top, to have compared with high power compared with bottom, depend on that the content of institute's projection and spectators, just in the type of On-site Experience, can obtain being greater than resolution and the brightness in the peripheral vision region in dome top in central observation region.Image curling 5 can be revised the geometric distortion being produced by the non-linear amplification in vertical direction.The result of non-linear amplification can be: geometry is retained, but resolution and brightness in the top of dome are lowered, utilizing thus more available illumination and resolution in center of interest, and reduced contrast---this has reduced to the crossed reflex on center of interest.
After selecting new prism and/or adjusting angle, can again carry out for general geometric calibration and the color of optimum experience and assemble both.In a configuration, between can and adjusting in the selection of prism, set up contact, make Geometric corrections can follow selected prism and angle.For example, sensor can the selected prism of sensing and angle, and sends information data to curling system 5, and it can select relevant calibration in advance Geometric corrections.Alternatively, servo-drive system capable of regulating prism angle.Servo-drive system and curling system can be by control system operations and synchronous.
Projector 1 can be 3 chip 4K DLP tMmotion-picture projection instrument, has 1.38 " dmd chip, for example Christie CP4230 or Barco DP4K.Tight shot 4 can be to have the focal length of about 15mm and the fish-eye lens of 2.4 f#.The aperture of object lens can be greater than some the aperture in independent lens element, and the brightness (vignetting) that it can increase center, therefore reduces the crossed reflex in dome.Spectral separation stero can be Dolby tM3D, Panavision3D or Infitec replace filter wheel or non-alternately light filter.Curling system can be the geometric function being included in the 7th sense " Δ " media server.Distortion adapter can be by forming according to the single triangular prism at angles of 10 degree, and it is positioned at and has capable of regulating vertical angle and thinner edge surface before tight shot down.Can be projected image according to a great part of expecting dome and cover to adjust vertical angle, and it for example can be arranged to 25 degree.For example, prism can be the n-BK7 glass with the angle of wedge of 8.7 degree, and can produce in one direction 33% image stretching, extension.
For example, in the time using significant image to stretch (33% vertical image stretches), selected prism can leave prism and cause there is significantly angle color separated along with light.Even if can adjust the converged position from the light of each Color Channel in curling unit 5 with the image in Fig. 3, may there is another problem, that is, the narrow wavelength bandwidth of color further extends to produce more fat (fatter) pixel angularly.Image is curling may not revise more fat pixel problem.For example, use the n-BK7 with the 8.7 degree angles of wedge can make to have pixel in the optical projection system of 4k image in different resolution modulator and become in one direction fat nearly 66%.This situation may be suitable for having the green glow of the centre wavelength of 532 nanometers and the bandwidth of +/-10 nanometers.
For example, stretch and each projected image of showing on screen can comprise three independently colored pixels images through single prism distortion adapter, to form pixel image on screen.The width that each Color Channel has can be light wavelength.The bandwidth that is used for the light wavelength of a color can be focused at the space of a pixel on screen.If prism is by color separated to larger extreme, the light being associated with Color Channel can further extend angularly in the time leaving prism, makes shown pixel become fat.Pixel becomes more fat for each colored pixels, fuzzyly can become apparent for observer, and this is less desirable.The light wavelength bandwidth of a color that enters single prism is wider, leaves that the angular spread of light of prism is larger and pixel is more fat.In the time reducing the light wavelength bandwidth of a Color Channel, can there is the less angular spread of the light that leaves prism.Because the curling unit 5 of image is can not compensation pixel fuzzy, so may need other solutions.Can complete and use second prism of connecting with the first prism to compensate color separated, but the second prism may be large and not be practicable selection.Replacement solution can be adjustment or reduce the bandwidth for the light wavelength of each Color Channel.But balance may mean that loss is for showing the more how light of image.Optical projection system can be used wideband light source, wherein creates Color Channel by color separated optical element, such as prism or the color filter of Philip, such as in the colour wheel (rotating color wheel) of rotation.Make with single prism image stretch and in order to keep, between the brightness of image of picture quality, may having the return reducing.For depending on the optical projection system of wideband light source, can complete the further constriction for the bandwidth of each color, but it may not acceptable solution in the time of the further stretching, extension of carries out image.Other method is to use the very light source of arrowband, such as the LASER Light Source in optical projection system, has single prism distorted projections adapter.LASER Light Source can have the very narrow bandwidth of light wavelength, and it can use to revise the gamut on display combinedly with curling unit 5 together with single prism element.System based on laser can be expanded the expansion service of single prism element, and curling unit can compensate the additional images gamut between Color Channel in the time showing stretching, extension image.
For example, the laser instrument around centre frequency with +/-1 nano wave length bandwidth can be used together with single prism anamorphote and obtain the color separated of in fact any amount and the therefore image stretching, extension of any amount.In the time using the LASER Light Source of unusual arrowband, can consider another factor such as spot.
The very LASER Light Source of arrowband amount that latent defect is the hot spot of these sources generations.Can be used as less desirable visual picture pseudomorphism (artifact) and appear on display from the hot spot of LASER Light Source.The amount of the hot spot that can observe can increase along with the increase of the optical wavelength bandwidth of laser.A method that reduces hot spot can be the bandwidth that increases the wavelength of LASER Light Source.But the bandwidth of increase can cause the fat pixel problem stretching for extremal graph picture in the time using single prism distortion adapter.The bandwidth of the wavelength of the LASER Light Source using in extremal graph picture stretches can be based on producing the amount of hot spot and pixel fog or become the compromise between fat program.
As using in the application of 3D projection of optical spectrum encoded spectral separation stero of left eye and eye image, each projected image can have the different narrow band bandwidth of ruddiness, green glow and blue light.The maximum bandwidth of the wavelength of two different bandwidths (each for eyes) in same Color Channel can be subject to being considered to the FR restriction of for each Color Channel acceptable redness or green or blue color spectrum.For example, can be in the wavelength limit that is considered to define red channel aspect acceptable content of watching result by producing for red image.In this bandwidth range, can give a definition and there are two narrower wavelength bandwidths of centre frequency wavelength to prevent situation that less desirable Color Channel intersects thering is enough wavelength intervals between two centre frequencies and associated bandwidth.If maximum bandwidth each place in two centre frequencies is confined to 20 nanometers, the maximum pixel of fat pixel expansion can be confined in the case of previously described exemplary prism in 66%.If it is fuzzy that single prism distortion adapter is created in unacceptable fat pixel below the maximum bandwidth in each different bandwidth of the wavelength in described 3D optical projection system, can further limit the bandwidth of LASER Light Source.For example, the bandwidth of the wavelength of LASER Light Source can be confined to be less than 20 nanometers, such as 10 nanometers, further to reduce the fat pixel in above-mentioned example.During when increasing video modulator, such as the pixel resolution of the spatial light modulator of optical projection system, for example, to higher than 4k, may diminish for the Pixel Dimensions of given viewing area, and occur not expect that the bandwidth of the wavelength of pixel before fuzzy may be narrower.
Fig. 4 shows the example of the effect of the chromatic aberation in anamorphic prism.Here for illustration purposes prism angle and aberration are amplified.Locate and make the adjusted high-quality prism stretching with the acquisition degree of depth of its angle can show little dissimilar aberration close to the infinity focus of projection objective, except the significant chromatic aberation of possibility.Little beam is dispersed into much wide beam, and it can produce again fuzzy significantly on screen.
Fig. 5 illustrates the aberration in the situation of having inserted narrow band filter, such as Dolby 3D filter wheel.Some spectrum is removed, and remaining is three arrow beam of lights corresponding to three arrowbands being launched by narrow band filter.Because light beam is spatially separated, so fuzzy amount golden cup slightly reduces.The wide wavelength bandwidth of light can leave prism with large angular spread, as shown in Figure 4.Enter the wavelength bandwidth of prism by constriction, light can leave with much smaller angular spread, as shown in Figure 5.
Fig. 6 shows aberration, and again, in this aberration, in each of three planes of color of assembling for color, projected image is geometrically digitally being revised by the curling unit in Fig. 3 for example.Three arrow beam of lights impinge upon over each other in projection surface.Therefore, can reduce significantly fuzzy.
In the time that each the angular spread increase of optical wavelength in three colors in Fig. 6 is caused the amount of the dimness of vision pseudomorphism being associated with fat pixel problem by single prism, can quote following methods and control fat pixel problem.
Fig. 8 illustrates the method that uses the optical distortion element such as single prism distortion adapter to carry out projection.An example with the optical projection system of single prism deformation element of the method that can be used for execution graph 8 is the optical projection system shown in Fig. 3.Certainly can use other optical projection systems.
In square frame 820, adjust the light wavelength bandwidth for a Color Channel.In some aspects, adjust compensation bandwidth after making to use up to show image, described light has been used single prism distortion adapter and has stretched and use view data to modify at least one Color Channel.Then can described in following trifle, again modify, stretch and show thering is the light of adjusted wavelength bandwidth.
Can adjust bandwidth to be applicable to single prism distortion adapter, stretch to realize optimized image, otherwise aberration cannot be realized the fat pixel problem that possibly cannot revise due to the curling technology of color.Can reduce the angular spread of the light that leaves single prism distortion adapter by reducing the bandwidth adjustment of the light in Color Channel.Effectively, can control fat pixel problem.The example that is used for the technology of adjusting Color Channel bandwidth comprises interpolation color filter, adds capable of regulating color filter, has interchangeable color filter and have interchangeable colour wheel wave filter.Replacement method can relate to light source design is become to have light transmitting, and this light transmitting has and is suitable for simple lens prism distortion adapter most the minimized required wavelength bandwidth of fat pixel problem is distributed.Other method can be the source that Color Channel is used to the narrow as far as possible wavelength bandwidth with light, such as LASER Light Source.Diode laser is the example of this type of laser instrument, and it can be used as having the light source that reduces a lot of fat pixel problems.
In square frame 824, revise a Color Channel of light by view data and revised image light to produce.Can visit view data in the mode of any number, such as from the server optical projection system, from for optical projection system away from server, or it can remotely be accessed.View data can be that feature presents.The example that can carry out the equipment of this modification is spatial light modulator (SLM), or uses electricity such as view data input data to revise not to be imaged the equipment producing through the reception light of the light of imaging.The example of SLM equipment comprises digital mirroring device (DMD) or liquid crystal over silicon (LOCS) equipment or liquid crystal (LC) equipment.The light being received by SLM can be from a Color Channel or multiple Color Channel.For example, in typical three Color Channel systems, Color Channel can be red, green and blue.Wideband light source such as hernia lamp can be exported the light of wide range, wherein, can light be separated into three Color Channels by light filter or philips prisms.For light being remained on to high as far as possible level, each optical channel can have large as far as possible bandwidth to guarantee can be used for producing bright image for most of light of each color in limited spectrum.Conventionally the digital projection system that uses SLM can be arranged to show the brightest possible image.But, in the time that this type of system configuration is become to show the image stretching, for the light wavelength bandwidth of each color may can complete become aspect how many image stretching, extensions have restricted.
Can also revise the view data in square frame 824 by the view data of being revised by the curling processor of color.Can make view data curling so that from a Color Channel through the light of imaging with converge on display screen from the light through imaging of another Color Channel.For example, convergence function can be carried out in the curling unit in Fig. 3.
In square frame 832, can make the projected image from projecting lens with single prism distortion adapter.For example, Fig. 3 illustrates the optical projection system with projecting lens 4 and single prism element 6, and wherein image stretches in vertical direction.Prism element 6 can have micro prisms angle (for example 10 degree), make this stretching, extension can be so not large and color separated can be not remarkable like that.This micro prisms can be made by low dispersion, and is designed such that coma is minimum and manageable.Along with the prism angle of micro prisms increases, can there is larger image to stretch.With using wideband light source and light being separated into the exemplary projection system of Color Channel, the amount that image stretches can be subject to the restriction of the bandwidth of the light in Color Channel.
In square frame 836, show and stretch image.In arenas, on projection surface or screen, show image.For example, can in the dome projection surface 2 in Fig. 3, show stretching, extension image.
In a second aspect of the present invention, in the configuration of Fig. 2 or Fig. 3, can replace dome-shaped projection surface by another shape, such as straight line screen, it can be that large smooth or curved surface projection is surperficial, covers most of observer visual field, has therefore realized experience on the spot in person.Projection surface in vertical direction there is the aspect ratio higher than the aspect ratio R of image formation component.Capable of regulating prism 6 and/or prism 7, make image can fill up in essence projection surface and eliminate " secret note " on top and the bottom of projection surface.
Fig. 7 shows and is not positioned at the example of the utilization in the region of the image formation component in the situation of the distortion adapter before tight shot.
Although described this theme in detail with respect to its particular aspects and example, the technology people who it will be appreciated that this area can easily produce aspect this type of and change, modification and the equivalent of example in the time obtaining the understanding of aforementioned content.Correspondingly, be understood that disclosure object presented for purpose of illustration and not limitation proposes, and do not get rid of this type of modification, the change of this theme and/or comprising of adding, as apparent in being easy to for a person skilled in the art.

Claims (15)

1. a method for digital projection, comprising:
Utilize view data to revise to have the Color Channel of light of wavelength bandwidth to produce the light through imaging;
In the time the described light display through imaging being shown on screen by optical distortion element, the described light through imaging is launched angularly; And
Reduce the angular spread of the described light through imaging that leaves described optical distortion element by adjusting described wavelength bandwidth.
2. method according to claim 1, wherein said optical distortion element is single prism distortion adapter.
3. method according to claim 2, also comprises: revise the magnification of the described light through imaging in vertical dimensions by described single prism distortion adapter.
4. method according to claim 2, also comprises: revise the magnification of the described light through imaging in horizontal dimensions by described single prism distortion adapter.
5. method according to claim 1, also comprises:
Utilize described view data to revise the second Color Channel of light,
Wherein said view data is revised by the curling processor of color, is focused on screen with the light through imaging from described the second Color Channel that leaves described optical distortion element with the described light through imaging that makes at least one Color Channel that leaves described optical distortion element.
6. the method for claim 1, also comprises: the required wavelength bandwidth of the light of described at least one Color Channel is designed in light source transmitting.
7. for a system for digital projection, described system comprises:
Spatial light modulator, is suitable for utilizing view data to revise light to produce the light through imaging, and described light has wavelength bandwidth and from least one Color Channel;
Projecting lens, is suitable for the light through imaging described in projection; And
Single prism distortion adapter of the output of described projecting lens, by described single prism distortion adapter, the described light through imaging is configured to be projected the demonstration on screen, and wherein said single prism distortion adapter is arranged to the described light making from described at least one Color Channel and launches angularly;
Wherein said system is suitable for reducing by adjusting described wavelength bandwidth the angular spread of the described light through imaging that leaves described optical distortion element.
8. system according to claim 7, also comprises light source, and described light source is suitable for being designed to required wavelength bandwidth to be included in the transmitting of described light source.
9. system according to claim 8, wherein said light source is LASER Light Source.
10. system according to claim 9, wherein said LASER Light Source is laser diode light source.
11. systems according to claim 7, also comprise:
The curling processor of color, is suitable for making leave the described light through imaging of described single prism distortion adapter and leave being focused on described screen through the light of imaging from second of the second Color Channel of described single prism distortion adapter by revising described view data.
12. systems according to claim 7, also comprise described screen, and wherein said screen is dome screen.
13. systems according to claim 7, wherein said system is arranged in dual-projection instrument system.
14. systems according to claim 7, wherein said spatial light modulator is 4K spatial light modulator,
Wherein be configured to be reduced to for the described wavelength bandwidth of the light source of a color and be less than 10 nanometers.
15. systems according to claim 7, wherein the described wavelength bandwidth of light source is configured to be reduced to and is less than 20 nanometers.
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US20140300708A1 (en) 2014-10-09
US10073328B2 (en) 2018-09-11
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US20170034488A1 (en) 2017-02-02
WO2013057717A1 (en) 2013-04-25

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